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Prairie Strips Improve Biodiversity And The Delivery Of Multiple Ecosystem Services From Corn–Soybean Croplands, Lisa A. Schulte, Jarad Niemi, Matthew J. Helmers, Matt Liebman, J. Gordon Arbuckle, David E. James, Randall K. Kolka, Matthew E. O'Neal, Mark D. Tomer, John C. Tyndall, Heidi Asbjornsen, Pauline Drobney, Jeri Neal, Chris Witte 2018 Iowa State University

Prairie Strips Improve Biodiversity And The Delivery Of Multiple Ecosystem Services From Corn–Soybean Croplands, Lisa A. Schulte, Jarad Niemi, Matthew J. Helmers, Matt Liebman, J. Gordon Arbuckle, David E. James, Randall K. Kolka, Matthew E. O'Neal, Mark D. Tomer, John C. Tyndall, Heidi Asbjornsen, Pauline Drobney, Jeri Neal, Chris Witte

Jarad Niemi

Loss of biodiversity and degradation of ecosystem services from agricultural lands remain important challenges in the United States despite decades of spending on natural resource management. To date, conservation investment has emphasized engineering practices or vegetative strategies centered on monocultural plantings of nonnative plants, largely excluding native species from cropland. In a catchment-scale experiment, we quantified the multiple effects of integrating strips of native prairie species amid corn and soybean crops, with prairie strips arranged to arrest run-off on slopes. Replacing 10% of cropland with prairie strips increased biodiversity and ecosystem services with minimal impacts on crop production. Compared with ...


Producing Food, Feed And Energy: How Can Agriculture Do It All?, Emily Heaton, Lisa Schulte-Moore, Matt Helmers, Matt Liebman 2018 Iowa State University

Producing Food, Feed And Energy: How Can Agriculture Do It All?, Emily Heaton, Lisa Schulte-Moore, Matt Helmers, Matt Liebman

Matthew J. Helmers

Sustainable intensification of agricultural systems has been suggested—in addition to reducing waste and changing consumption habits—as a way to increase food, feed, fuel, and fiber security in the 21st century. Here we describe three primary strategies of agricultural intensification—conventional intensification, temporal intensification, and spatial intensification—and how they can be used to manage and integrate food and second-generation (2G) crop portfolios. While each strategy has individual merits, combining them to meet case-specific targets may achieve optimum results. Multiple experiments and examples from Iowa, USA illustrate the potential of combining these approaches for agroecological intensification that can provide ...


Generation Of Maize (Zea Mays) Doubled Haploids Via Traditional Methods, Kimberly Vanous, Adam Vanous, Ursula Frei, Thomas Lubberstedt 2018 Iowa State University

Generation Of Maize (Zea Mays) Doubled Haploids Via Traditional Methods, Kimberly Vanous, Adam Vanous, Ursula Frei, Thomas Lubberstedt

Thomas Lubberstedt

Commercial maize hybrid production has corroborated the usefulness of producing inbred lines; however, the delivery of new lines has always been a major time constraint in breeding programs. Traditional methods for developing inbred lines typically require 6 to 10 generations of self-pollination to obtain sufficient homozygosity. To bypass the time and costs associated with the development of inbred lines, doubled haploid (DH) systems have been widely adopted in the commercial production of maize. Within just two generations, DH systems can create completely homozygous and homogeneous lines. A typical maize DH system, utilizing anthocyanin markers R1-nj or Pl1 for haploid selection ...


Discrimination Of Haploid And Diploid Maize Kernels Via Multispectral Imaging, Gerald N. De La Fuente, Jens Michael Carstensen, Michael A. Edberg, Thomas Lubberstedt 2018 Iowa State University

Discrimination Of Haploid And Diploid Maize Kernels Via Multispectral Imaging, Gerald N. De La Fuente, Jens Michael Carstensen, Michael A. Edberg, Thomas Lubberstedt

Thomas Lubberstedt

The use of doubled haploids (DHs) in maize has become ubiquitous in maize breeding programmes as it allows breeders to go from cross to evaluation in as little as 2 years. Two important aspects of the in vivo DH system used in maize are as follows: (i) the identification of haploid progeny and (ii) doubling of the haploid genome to produce fertile inbred lines. This study is focused on the first step. Currently, identification of maize haploid progeny is performed manually using the R1-nj seed colour marker. This is a labour-intensive and time-consuming process; a method for automated sorting of ...


Aac Penhold Canada Prairie Spring Red Wheat, R. D. Cuthbert, R. M. DePauw, R. E. Knox, Asheesh K. Singh, T. N. McCaig, B. McCallum, T. Fetch, B. L. Beres 2018 Agriculture and Agri-Food Canada

Aac Penhold Canada Prairie Spring Red Wheat, R. D. Cuthbert, R. M. Depauw, R. E. Knox, Asheesh K. Singh, T. N. Mccaig, B. Mccallum, T. Fetch, B. L. Beres

Asheesh Singh

AAC Penhold, an awned hard red spring wheat (Triticum aestivum L.) cultivar, yielded significantly more grain than 5700PR while maturing 2 days earlier, and 7.5 cm shorter stature. The seed size was significantly larger than 5700PR and 5701PR, with a test weight significantly heavier than both checks. AAC Penhold expressed resistance to prevalent races of leaf rust and common bunt, and moderate resistance to fusarium head blight and stem rust. AAC Penhold had higher grain and flour protein than the checks and improved Hagberg Falling Number, amylograph viscosity, and water absorption. AAC Penhold is eligible for grades of the ...


Identifying New Sources Of Resistance To Brown Stem Rot In Soybean, Chantal E. McCabe, Asheesh K. Singh, Leonor F. Leandro, Silvia R. Cianzio, Michelle A. Graham 2018 Iowa State University

Identifying New Sources Of Resistance To Brown Stem Rot In Soybean, Chantal E. Mccabe, Asheesh K. Singh, Leonor F. Leandro, Silvia R. Cianzio, Michelle A. Graham

Asheesh Singh

Brown stem rot (BSR), caused by the fungus Phialophora gregata f. sp. sojae (Allington & D.W. Chamberlain) W. Gams (syn. Cadophora gregata), causes yield losses up to 38%. Three dominant BSR-resistant genes have been identified: Rbs1, Rbs2, and Rbs3. Additional BSR resistance loci will complement breeding efforts by expanding the soybean [Glycine max (L.) Merr.] genetic base. The objective of this research was to determine if PI 594637, PI 594638B, PI 594650A, and PI 594858B contained novel BSR resistance genes. The accessions were crossed to three genotypes with known BSR resistance genes and populations were developed for allelism studies. A ...


Leveraging Genomic Prediction To Scan Germplasm Collection For Crop Improvement, Leonardo de Azevedo Peixoto, Tara C. Moellers, Jiaoping Zhang, Aaron J. Lorenz, Leonardo L. Bhering, William D. Beavis, Asheesh K. Singh 2018 Federal University of Vicosa

Leveraging Genomic Prediction To Scan Germplasm Collection For Crop Improvement, Leonardo De Azevedo Peixoto, Tara C. Moellers, Jiaoping Zhang, Aaron J. Lorenz, Leonardo L. Bhering, William D. Beavis, Asheesh K. Singh

Asheesh Singh

The objective of this study was to explore the potential of genomic prediction (GP) for soybean resistance against Sclerotinia sclerotiorum (Lib.) de Bary, the causal agent of white mold (WM). A diverse panel of 465 soybean plant introduction accessions was phenotyped for WM resistance in replicated field and greenhouse tests. All plant accessions were previously genotyped using the SoySNP50K BeadChip. The predictive ability of six GP models were compared, and the impact of marker density and training population size on the predictive ability was investigated. Cross-prediction among environments was tested to determine the effectiveness of the prediction models. GP models ...


Advancing Our Understanding Of Charcoal Rot In Soybeans, Martha P. Romero Luna, Daren Mueller, Alemu Mengistu, Asheesh K. Singh, Glen L. Hartman, Kiersten A. Wise 2018 Purdue University

Advancing Our Understanding Of Charcoal Rot In Soybeans, Martha P. Romero Luna, Daren Mueller, Alemu Mengistu, Asheesh K. Singh, Glen L. Hartman, Kiersten A. Wise

Asheesh Singh

Charcoal rot [Macrophomina phaseolina (Tassi) Goid] of soybean [Glycine max (L.) Merr.] is an important but commonly misidentified disease, and very few summary articles exist on this pathosystem. Research conducted over the past 10 yr has improved our understanding of the environment conducive to disease development, host resistance, and improved disease diagnosis and management. This article summarizes the currently available research with an emphasis on disease management.


Delayed Senescence In Soybean: Terminology, Research Update, And Survey Results From Growers, C. J. Harbach, T. W. Allen, C. R. Bowen, J. A. Davis, C. B. Hill, M. Leitman, B. R. Leonard, D. S. Mueller, G. B. Padgett, X. A. Phillips, R. W. Schneider, E. J. Sikora, A. K. Singh, G. L. Hartman 2018 University of Illinois at Urbana-Champaign

Delayed Senescence In Soybean: Terminology, Research Update, And Survey Results From Growers, C. J. Harbach, T. W. Allen, C. R. Bowen, J. A. Davis, C. B. Hill, M. Leitman, B. R. Leonard, D. S. Mueller, G. B. Padgett, X. A. Phillips, R. W. Schneider, E. J. Sikora, A. K. Singh, G. L. Hartman

Asheesh Singh

The terms used to describe symptoms of delayed senescence in soybean often are used inconsistently or interchangeably and do not adequately distinguish the observed symptoms in the field. Various causes have been proposed to explain the development of delayed senescence symptoms. In this article, we review published reports on delayed senescence symptoms in soybean, summarize current research findings, provide examples of terms related to specific symptoms, and present an overview of the results of a multi-state survey directed to soybean growers to understand their concerns about delayed soybean senescence. Some of these terms, such as green bean syndrome and green ...


Main And Epistatic Loci Studies In Soybean For Sclerotinia Sclerotiorum Resistance Reveal Multiple Modes Of Resistance In Multi-Environments, Tara C. Moellers, Arti Singh, Jiaoping Zhang, Jae Brungardt, Mehdi Kabbage, Daren S. Mueller, Craig R. Grau, Ashish Ranjan, Damon L. Smith, R. V. Chowdy-Reddy, Asheesh K. Singh 2018 Iowa State University

Main And Epistatic Loci Studies In Soybean For Sclerotinia Sclerotiorum Resistance Reveal Multiple Modes Of Resistance In Multi-Environments, Tara C. Moellers, Arti Singh, Jiaoping Zhang, Jae Brungardt, Mehdi Kabbage, Daren S. Mueller, Craig R. Grau, Ashish Ranjan, Damon L. Smith, R. V. Chowdy-Reddy, Asheesh K. Singh

Asheesh Singh

Genome-wide association (GWAS) and epistatic (GWES) studies along with expression studies in soybean [Glycine max (L.) Merr.] were leveraged to dissect the genetics of Sclerotinia stem rot (SSR) [caused by Sclerotinia sclerotiorum (Lib.) de Bary], a significant fungal disease causing yield and quality losses. A large association panel of 466 diverse plant introduction accessions were phenotyped in multiple field and controlled environments to: (1) discover sources of resistance, (2) identify SNPs associated with resistance, and (3) determine putative candidate genes to elucidate the mode of resistance. We report 58 significant main effect loci and 24 significant epistatic interactions associated with ...


Genetic Architecture Of Charcoal Rot (Macrophomina Phaseolina) Resistance In Soybean Revealed Using A Diverse Panel, Sara M. Coser, R. V. Chowda Reddy, Jiaoping Zhang, Daren S. Mueller, Alemu Mengistu, Kiersten A. Wise, Tom W. Allen, Arti Singh, Asheesh K. Singh 2018 Iowa State University

Genetic Architecture Of Charcoal Rot (Macrophomina Phaseolina) Resistance In Soybean Revealed Using A Diverse Panel, Sara M. Coser, R. V. Chowda Reddy, Jiaoping Zhang, Daren S. Mueller, Alemu Mengistu, Kiersten A. Wise, Tom W. Allen, Arti Singh, Asheesh K. Singh

Asheesh Singh

Charcoal rot (CR) disease caused by Macrophomina phaseolina is responsible for significant yield losses in soybean production. Among the methods available for controlling this disease, breeding for resistance is the most promising. Progress in breeding efforts has been slow due to the insufficient information available on the genetic mechanisms related to resistance. Genome-wide association studies (GWAS) enable unraveling the genetic architecture of resistance and identification of causal genes. The aims of this study were to identify new sources of resistance to CR in a collection of 459 diverse plant introductions from the USDA Soybean Germplasm Core Collection using field and ...


Arizona Registered Dietitians Show Gaps In Knowledge Of Bean Health Benefits, Donna M. Winham, Andrea M. Hutchins, Sharon V. Thompson, Mariah K. Dougherty 2018 Iowa State University

Arizona Registered Dietitians Show Gaps In Knowledge Of Bean Health Benefits, Donna M. Winham, Andrea M. Hutchins, Sharon V. Thompson, Mariah K. Dougherty

Donna Winham

Registered Dietitians (RDs) promote nutrition practices and policies and can influence food consumption patterns to include nutrient dense foods such as beans. Although many evidence-based health benefits of bean consumption (e.g., cholesterol reduction, glycemic control) have been demonstrated, there is limited research on the knowledge, attitudes, and perceptions of RDs regarding the inclusion of beans in a healthy diet. To fill this existing research gap, this cross-sectional survey explored the perceptions, knowledge, and attitudes of 296 RDs in Arizona, USA, toward beans. The RDs largely held positive attitudes toward the healthfulness of beans and were aware of many health ...


A High-Throughput, Field-Based Phenotyping Technology For Tall Biomass Crops, Maria G. Salas Fernandez, Yin Bao, Lie Tang, Patrick Schnable 2018 Iowa State University

A High-Throughput, Field-Based Phenotyping Technology For Tall Biomass Crops, Maria G. Salas Fernandez, Yin Bao, Lie Tang, Patrick Schnable

Lie Tang

Recent advances in "omics" technologies have not been accompanied by equally efficient, cost-effective and accurate phenotyping methods required to dissect the genetic architecture of complex traits. Even though high-throughput phenotyping platforms have been developed for controlled environments, field-based aerial and ground technologies have only been designed and deployed for short stature crops. Therefore, we developed and tested Phenobot 1.0, an auto-steered and self-propelled field-based high-throughput phenotyping platform for tall dense canopy crops, such as sorghum (Sorghum bicolor L. Moench). Phenobot 1.0 was equipped with laterally positioned and vertically stacked stereo RGB cameras. Images collected from 307 diverse sorghum ...


A Foxtail Mosaic Virus Vector For Virus-Induced Gene Silencing In Maize, Yu Mei, Chunquan Zhang, Bliss M. Kernodle, John H. Hill, Steven A. Whitham 2018 Iowa State University

A Foxtail Mosaic Virus Vector For Virus-Induced Gene Silencing In Maize, Yu Mei, Chunquan Zhang, Bliss M. Kernodle, John H. Hill, Steven A. Whitham

Steven Whitham

Plant viruses have been widely used as vectors for foreign gene expression and virus-induced gene silencing (VIGS). A limited number of viruses have been developed into viral vectors for the purposes of gene expression or VIGS in monocotyledonous plants, and among these, the tripartite viruses Brome mosaic virus and Cucumber mosaic virus have been shown to induce VIGS in maize (Zea mays). We describe here a new DNA-based VIGS system derived from Foxtail mosaic virus (FoMV), a monopartite virus that is able to establish systemic infection and silencing of endogenous maize genes homologous to gene fragments inserted into the FoMV ...


Virus-Induced Gene Silencing And Transient Gene Expression In Soybean (Glycine Max) Using Bean Pod Mottle Virus Infectious Clones, Steven A. Whitham, Lori M. Lincoln, R. V. Chowda-Reddy, Jaime D. Dittman, Jamie A. O'Rourke, Michelle A. Graham 2018 Iowa State University

Virus-Induced Gene Silencing And Transient Gene Expression In Soybean (Glycine Max) Using Bean Pod Mottle Virus Infectious Clones, Steven A. Whitham, Lori M. Lincoln, R. V. Chowda-Reddy, Jaime D. Dittman, Jamie A. O'Rourke, Michelle A. Graham

Steven Whitham

Virus-induced gene silencing (VIGS) is a powerful and rapid approach for determining the functions of plant genes. The basis of VIGS is that a viral genome is engineered so that it can carry fragments of plant genes, typically in the 200 to 300 base pair size range. The recombinant viruses are used to infect experimental plants, and wherever the virus invades, the target gene or genes will be silenced. VIGS is thus transient, and in the span of a few weeks, it is possible to design VIGS constructs and then generate loss-of-function phenotypes through RNA silencing of the target genes ...


Soybean Functional Genomics: Bridging The Genotype-To-Phenotype Gap, Jamie A. O'Rourke, Michelle A. Graham, Steven A. Whitham 2018 United States Department of Agriculture

Soybean Functional Genomics: Bridging The Genotype-To-Phenotype Gap, Jamie A. O'Rourke, Michelle A. Graham, Steven A. Whitham

Steven Whitham

Technological advances coupled with the economic importance of soybean have led to increased efforts to understand gene function and associate genes with phenotypes of agronomic and fundamental interest. Functional genomics approaches aim to develop sufficient understanding needed to bridge the genotype-to-phenotype gap. In general terms, functional genomics approaches begin by using highly parallelized methods to analyze genomes, transcriptomes, proteomes, and metabolomes to generate hypotheses about genes that control phenotypes. Candidate genes are then tested for their contributions to phenotypes through various methods such as RNA silencing, genetic mutation, or overexpression. In this chapter, we review the current approaches, tools, and ...


Dynamic Transcriptome Profiling Of Bean Common Mosaic Virus (Bcmv) Infection In Common Bean (Phaseolus Vulgaris L.), Kathleen Martin, Jugpreet Singh, John H. Hill, Steven A. Whitham, Steven B. Cannon 2018 Kansas State University

Dynamic Transcriptome Profiling Of Bean Common Mosaic Virus (Bcmv) Infection In Common Bean (Phaseolus Vulgaris L.), Kathleen Martin, Jugpreet Singh, John H. Hill, Steven A. Whitham, Steven B. Cannon

Steven Whitham

Background

Bean common mosaic virus (BCMV) is widespread, with Phaseolus species as the primary host plants. Numerous BCMV strains have been identified on the basis of a panel of bean varieties that distinguish the pathogenicity types with respect to the viral strains. The molecular responses in Phaseolus to BCMV infection have not yet been well characterized.

Results

We report the transcriptional responses of a widely susceptible variety of common bean (Phaseolus vulgaris L., cultivar ‘Stringless green refugee’) to two BCMV strains, in a time-course experiment. We also report the genome sequence of a previously unreported BCMV strain. The interaction with ...


A Viral Protease Relocalizes In The Presence Of The Vector To Promote Vector Performance, Aurélie Bak, Andrea L. Cheung, Chunling Yang, Steven A. Whitham, Clare L. Casteel 2018 University of California, Davis

A Viral Protease Relocalizes In The Presence Of The Vector To Promote Vector Performance, Aurélie Bak, Andrea L. Cheung, Chunling Yang, Steven A. Whitham, Clare L. Casteel

Steven Whitham

Vector-borne pathogens influence host characteristics relevant to host–vector contact, increasing pathogen transmission and survival. Previously, we demonstrated that infection with Turnip mosaic virus, a member of one of the largest families of plant-infecting viruses, increases vector attraction and reproduction on infected hosts. These changes were due to a single viral protein, NIa-Pro. Here we show that NIa-Pro responds to the presence of the aphid vector during infection by relocalizing to the vacuole. Remarkably, vacuolar localization is required for NIa-Pro’s ability to enhance aphid reproduction on host plants, vacuole localization disappears when aphids are removed, and this phenomenon occurs ...


Description And Codification Of Miscanthus × Giganteus Growth Stages For Phenological Assessment, Mauricio D. Tejera, Emily A. Heaton 2018 Iowa State University

Description And Codification Of Miscanthus × Giganteus Growth Stages For Phenological Assessment, Mauricio D. Tejera, Emily A. Heaton

Emily Heaton

Triploid Miscanthus × giganteus (Greef et Deu. ex Hodkinson et Renvoize) is a sterile, perennial grass used for biomass production in temperate environments. While M. × giganteus has been intensively researched, a scale standardizing description of M. × giganteus morphological stages has not been developed. Here we provide such a scale by adapting the widely-used Biologische Bundesanstalt, Bundessortenamt, CHemische Industrie (BBCH) scale and its corresponding numerical code to describe stages of morphological development in M. × giganteus using observations of the “Freedom” and “Illinois” clone in Iowa, USA. Descriptive keys with images are also presented. Because M. × giganteus plants overlap in the field, the ...


Arizona Registered Dietitians Show Gaps In Knowledge Of Bean Health Benefits, Donna M. Winham, Andrea M. Hutchins, Sharon V. Thompson, Mariah K. Dougherty 2018 Iowa State University

Arizona Registered Dietitians Show Gaps In Knowledge Of Bean Health Benefits, Donna M. Winham, Andrea M. Hutchins, Sharon V. Thompson, Mariah K. Dougherty

Food Science and Human Nutrition Publications

Registered Dietitians (RDs) promote nutrition practices and policies and can influence food consumption patterns to include nutrient dense foods such as beans. Although many evidence-based health benefits of bean consumption (e.g., cholesterol reduction, glycemic control) have been demonstrated, there is limited research on the knowledge, attitudes, and perceptions of RDs regarding the inclusion of beans in a healthy diet. To fill this existing research gap, this cross-sectional survey explored the perceptions, knowledge, and attitudes of 296 RDs in Arizona, USA, toward beans. The RDs largely held positive attitudes toward the healthfulness of beans and were aware of many health ...


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